"We've already learned that the main difference between drawing and sculpture is one of dimension. While you can draw a picture so that objects appear to look three-dimensional, the surface on which you work is flat. Sculpture, however, has depth as well as length and width. The two kinds of sculpture are relief and in the round. Details project or stick out from a background in a relief sculpture, so they can be seen only from the front and sides. Figures on architecture, such as those found on the Arc de Triomphe in Paris, are good examples of this type. An in the round sculpture is free-standing, however, so it can be viewed from all sides. Henry Moore's Large Arch, which is located here in Columbus, is an example of an in the round sculpture."